Update badges in README to reflect Unitary Foundation name

[osop9604]

This Pull Request addresses issue #998. I made the following changes in the README:

1. Rename “Unitary Fund” to “Unitary Foundation”

   • Updated all text references to use the new name.

2. Align Badge Style

   • Modified the badges following the example from this reference README.
   • Adjusted badge format and links to match the desired style.

These changes focus on documentation and styling; they do not affect any core functionality of the project.

Additional Notes

• Feedback or further suggestions are welcome.
• Thank you for reviewing this Pull Request!

[vprusso]

Nice job, @osop9604 !

Thank you for your contribution to toqito, and I sincerely hope to see you around again! Thank you!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.9%. Comparing base (3573c4c) to head (d0e9ba6).
Report is 2 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1007   +/-   ##
======================================
  Coverage    97.9%   97.9%           
======================================
  Files         170     170           
  Lines        3328    3328           
  Branches      728     728           
======================================
  Hits         3260    3260           
  Misses         44      44           
  Partials       24      24           

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